Re: [RFC][PATCH 1/10] PM: Add flag for devices capable of generating run-time wake-up events

Rafael J. Wysocki
2009-11-16T20:52:38Z

On Monday 16 November 2009, Alan Stern wrote:
> On Mon, 16 Nov 2009, Rafael J. Wysocki wrote:
>
> > From: Rafael J. Wysocki <rjw@sisk.pl>
> >
> > Apparently, there are devices that can wake up the system from sleep
> > states and yet are incapable of generating wake-up events at run
> > time. Thus, introduce a flag indicating if given device is capable
> > of generating run-time wake-up events.
>
> This raises the question: Who is responsible for setting the new
> flag? The code that registers the device?

Yes, in general. The platform.

Actually, I needed it for PCI, but I thought it would be better to put it at
the core level.

> What if the kernel can't tell whether or not the device can generate
> runtime wake-up events?

Do you have any specific examples in mind?

> What if the user wants to override the kernel's setting? Should there
> be a sysfs attribute controlling the flag?

I have no plans for adding anything like that.

Rafael